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Aluminum-titanium doped silicon dioxide aerogel/fiber composite material and preparation method thereof

A technology of fiber composite materials and silica, applied in the field of high-temperature insulation materials, can solve problems such as poor mechanical properties, high temperature, and low melting point, achieve good stability and heat insulation performance, improve high-temperature resistance, and enhance The effect of strength and toughness

Active Publication Date: 2020-07-03
PAN ASIAN MICROVENT TECH JIANGSU CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But it should be seen that pure SiO 2 Airgel is brittle, has poor mechanical properties, and the radiation thermal conductivity changes greatly when the temperature rises, and its melting point is low, which seriously restricts the application of silica airgel in heat insulation and heat preservation, especially at high temperatures. insulation performance

Method used

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  • Aluminum-titanium doped silicon dioxide aerogel/fiber composite material and preparation method thereof
  • Aluminum-titanium doped silicon dioxide aerogel/fiber composite material and preparation method thereof
  • Aluminum-titanium doped silicon dioxide aerogel/fiber composite material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment 1: see figure 1 , figure 2

[0030] A preparation method of aluminum-titanium doped silica airgel / fiber composite material, comprising the following steps:

[0031] 1) Measure 2000 mL of absolute ethanol, 1000 mL of 0.01 mol L -1 Hydrochloric acid, weigh 100 g aluminum chloride hexahydrate and 50 g tetrabutyl titanate, add the above raw material reagents into the reaction kettle together, stir until completely dissolved; measure 1000 mL ethyl orthosilicate and add to the above mixed solution, Control the stirring time to 5 h to obtain a sol; slowly add 500 mL of 1-2, propylene oxide to the sol, and continue stirring for 5 min to obtain an aluminum-titanium-doped silica composite sol;

[0032] 2) Impregnate the cut high-silica glass fiber mat of 30 cm×30 cm×3 cm into the composite sol, take it out after the impregnation is complete, and lay the impregnated glass fiber mat on a flat plate; finish the impregnation Put the glass fiber mat into a plastic box ...

Embodiment 2

[0035] Embodiment 2: see image 3 , Figure 4

[0036] A preparation method of aluminum-titanium doped silica airgel / fiber composite material, comprising the following steps:

[0037] The main steps are the same as in Example 1, except that step 1) Weigh 50 g of aluminum chloride hexahydrate and 24 g of tetrabutyl titanate, and finally obtain an aluminum doping amount of 5 wt% silicon element, titanium element doping Aluminum-titanium doped silica airgel / fiber composite with 3 wt% silicon element.

[0038] The prepared aluminum-titanium-doped silica airgel / fiber composite has a smooth and wrinkle-free appearance, and the airgel and glass fiber are well combined, and the thermal conductivity is 0.030~0.035 W / (m∙K) at 25°C. The thermal conductivity at high temperature is 0.101~0.110 W / (m∙K).

Embodiment 3

[0039] Embodiment 3: see Figure 5 , Figure 6

[0040] The main steps are the same as in Example 1, except that step 1) Weigh 150 g of aluminum chloride hexahydrate and 80 g of tetrabutyl titanate, and finally obtain an aluminum doping amount of 15 wt% silicon element, titanium element doping Aluminum-titanium doped silica airgel / fiber composite with 10 wt% silicon element.

[0041] The prepared aluminum-titanium-doped silica airgel / fiber composite has a flat and wrinkle-free appearance, and the airgel and glass fiber are well combined, and the thermal conductivity is 0.033~0.037 W / (m∙K) at 25 °C. The thermal conductivity at high temperature is 0.100~0.105 W / (m∙K).

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Abstract

The invention discloses an aluminum-titanium doped silicon dioxide aerogel / fiber composite material and a preparation method thereof. The preparation method comprises the following steps: taking and adding absolute ethyl alcohol, a hydrochloric acid solution, aluminum chloride hexahydrate and tetrabutyl titanate into a reaction kettle, weighing and slowly pouring ethyl orthosilicate into the reaction kettle, and stirring to obtain a sol; adding a gel accelerator, and continuously stirring to obtain a composite sol; impregnating a glass fiber felt in the composite sol, and flatly paving the impregnated glass fiber mat on a flat plate; putting the glass fiber felt impregnated with the composite sol into a plastic box, sealing, carrying out gel aging, and replacing the aged gel / glass fiber composite material with a solvent; and performing supercritical drying on the gel / glass fiber composite material. The strength and toughness of the aerogel can be enhanced while the heat insulation property of the aerogel is reserved, the high-temperature resistance of the silicon dioxide aerogel is improved through aluminum element doping, and the prepared aerogel / fiber composite material has verygood stability and heat insulation property.

Description

technical field [0001] The invention relates to the field of high-temperature heat insulation materials, in particular to an aluminum-titanium-doped silica airgel / fiber composite material and a preparation method thereof. Background technique [0002] With the construction, electronics, food, chemical and other manufacturing industries, as well as national defense and military industries, the requirements for thermal insulation materials are getting higher and higher. Silica airgel has a very high porosity, which can reach more than 90%. Its porous network three-dimensional structure effectively reduces the heat transfer between the gas phase and the solid phase, so it has excellent thermal insulation performance. National key industrial fields such as energy saving and aerospace have important application prospects. But it should be seen that pure SiO 2 Airgel is brittle, has poor mechanical properties, and the radiation thermal conductivity changes greatly when the tempe...

Claims

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Application Information

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IPC IPC(8): C04B30/02
CPCC04B30/02C04B2201/32C04B14/42
Inventor 郭兴忠江包家祺邹畅雷伟张云丁荣华
Owner PAN ASIAN MICROVENT TECH JIANGSU CORP
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